Piston ring for internal combustion engine



FIG. 1.1 is a front view of a piston ring for an internal combustion engine of the present invention.

FIG. 1.2 is a rear view thereof.

FIG. 1.3 is a bottom plan view thereof.

FIG. 1.4 is a front perspective view showing the left side thereof.

FIG. 1.5 is a front perspective view showing the right side thereof.

FIG. 1.6 is an enlarged view defined by the circle 1.6 of FIG. 1.1.

FIG. 1.7 is an enlarged view defined by the circle 1.7 of FIG. 1.2.

FIG. 1.8 is an enlarged view defined by the circle 1.8 of FIG. 1.3.

FIG. 1.9 is an enlarged view defined by the circle 1.9 of FIG. 1.4.

FIG. 1.10 is an enlarged view defined by the circle 1.10 of FIG. 1.5.

The dash-dash broken lines depict portions of the piston ring which form no part of the claimed design and the dot-dash-dot broken lines depict the boundary of the claimed design and form no part thereof. 

CLAIM The ornamental design for a piston ring for an internal combustion engine, as shown and described. 